Electrovoice xn Техническое Руководство

The X-Array

™

 product line represents impor-

tant advancements in concert-sound rein-

forcement technology. The design goals

called for the highest acoustic output capa-

bility with the highest fidelity in lightweight,

compact enclosures that were easy to array.

The development began with a clean sheet

of paper and took an integrated approach.

The individual loudspeaker drivers, horns,

enclosures, rigging hardware and system

configurations were designed from the

ground up specifically for this high-perfor-

mance application.

The Xn is an active near-field, three-way,

semi-full-range LF/MB/HF loudspeaker

system with a rotatable 60° x 40° coverage

pattern. The high-frequency and mid-bass

sections are horn loaded with one driver in

each frequency band, and the HF horn/

driver combination is mounted coaxially in-

side the mid-bass horn. The low-frequency

section has one driver in a slot-loaded en-

closure. The woofer, horns and drivers were

designed as part of the Xn development

and represent a step forward in state-of-

the-art loudspeaker design in terms of high

acoustic output with low distortion and

low power compression. Electro-Voice en-

gineers developed a new technology

dubbed Ring-Mode Decoupling (RMD

™

)

to substantially improve clarity and intelli-

gibility by reducing both linear and non-

linear resonance modes that color the

sound.

The high-frequency driver in the Xn is the

ND5, which is a 3.56-mm (1.4-in.) exit high-

frequency compression driver that features

a powerful neodymium motor structure that

was optimized for maximum efficiency

and reduced power compression. A new

76.2-mm (3.0-in.)-diameter titanium dia-

phragm assembly provides increased instan-

taneous peak output capability and reduced

dome breakup. The ND5 is mounted on a

60° x 40° rotatable constant-directivity horn.

This combination results in substantially

improved vocal clarity and presence with a

smooth response throughout the vocal range

up to 20,000 Hz. The horn and driver are

nested inside the mid-bass phase plug assem-

bly to minimize interference in the mid-bass

band.

The mid-bass driver in the Xn is the ND12A,

which is a 30.5-mm (12-in.) mid-bass driver

that features a powerful new neodymium

motor structure that was optimized for maxi-

mum horn-loaded efficiency and reduced

power compression. A new Kevlar

®

-rein-

forced cone assembly provides a smooth

response with reduced cone break up. The

ND12A is mounted on a mid-bass horn that

has a coverage pattern that transitions

smoothly into the rotatable 60° x 40° high-

frequency pattern. The mid-bass phase plug

provides optimal loading for the ND12A

driver, delivering smooth response and ex-

tended efficiency up to 2,000 Hz. This com-

bination results in improved vocal intelligi-

bility and clarity with a smooth response

from the lower-to-mid vocal range.

The low-frequency driver in the Xn is the

EVX-180B, which is a high-excursion

457-mm (18-in.) woofer that has distin-

guished itself as an industry standard for

high-power, low-frequency reproduction.

The single slot-loaded, low-frequency

woofer in the Xn is less efficient than the

horn-loaded mid-bass- and high-frequency

sections and, as such, can provide low-to-

moderate levels of low-frequency repro-

duction.  For high levels of low-frequency

reproduction, addditional woofer systems

must be added (Xb, Xcb and/or Xds).   Dur-

ing the X-Array

™

 development, the ther-

mal conduction of the motor was improved

and the suspension was redesigned giv-

ing the EVX-180B even lower power com-

pression and longer mechanical lifetime.

In the Xn, the woofer is slot loaded in a

sealed enclosure optimized for maximized

output from 48-160 Hz with minimized dis-

tortion.  Ring-Mode Decoupling, (RMD

™

)

is a technique utilized and named by

Electro-Voice to describe a process used